function change(num) {
    var _h3 = document.querySelectorAll('.search ul li');
    var _dian = document.querySelectorAll('.port');
    var _page = document.querySelectorAll('.page');
    for(var i = 0;i<_h3.length;i++){
        _h3[i].className = '';
        _dian[i].style.display = 'none';
        _page[i].style.display = 'none';
    }
    _h3[num].className = 'active';
    _dian[num].style.display = 'flex';
    _page[num].style.display = 'block';
}
